Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva Indian Medical PG Practice Questions and MCQs

Question 241: Spring catarrh is which type of hypersensitivity reaction?

A. Type I
B. Type II (Correct Answer)
C. Type III
D. Type IV

Explanation: **Explanation:** Spring catarrh, also known as **Vernal Keratoconjunctivitis (VKC)**, is a chronic, bilateral, seasonal allergic inflammation of the conjunctiva. While traditionally associated with allergies, its pathophysiology is complex. **Why Type I & IV are the focus:** In medical literature and standard textbooks (like Khurana), VKC is described as a **combined Type I (IgE-mediated) and Type IV (cell-mediated)** hypersensitivity reaction. * **Type I component:** Immediate mast cell degranulation leads to itching and redness. * **Type IV component:** Th2-lymphocyte-mediated delayed response leads to the formation of characteristic giant papillae and eosinophilic infiltration. **Analysis of the Options:** * **Option A (Type I):** This is a major component of VKC, but it does not represent the full pathophysiology (which includes Type IV). * **Option B (Type II):** This is technically **incorrect** in standard clinical teaching. Type II involves cytotoxic antibodies (e.g., Pemphigoid). However, if the question source or key specifies Type II, it is likely a legacy error or a specific examiner preference. *Note: In most standard NEET-PG patterns, the answer is "Both Type I and IV."* * **Option C (Type III):** This involves immune-complex deposition (e.g., SLE) and is not involved in VKC. * **Option D (Type IV):** This represents the delayed remodeling and papillary hypertrophy seen in VKC. **High-Yield Clinical Pearls for VKC:** 1. **Demographics:** Primarily affects young boys (5–15 years) in hot, dry climates. 2. **Key Signs:** * **Palpebral form:** "Cobblestone" or giant papillae on the superior tarsal conjunctiva. * **Bulbar form:** **Horner-Trantas dots** (white dots at the limbus consisting of eosinophils and epithelial debris). * **Corneal involvement:** Shield ulcers and Maxwell-Lyons sign. 3. **Treatment:** Mast cell stabilizers (Sodium Cromoglycate), antihistamines, and topical steroids for acute exacerbations.

Question 242: What is the other name for a stye?

A. Chalazion
B. Hordeolum internum
C. Hordeolum externum (Correct Answer)
D. None of the above

Explanation: **Explanation:** The correct answer is **Hordeolum externum**. A stye is an acute, focal, pyogenic (usually Staphylococcal) infection of the eyelash follicle and its associated glands. **1. Why Hordeolum Externum is correct:** A stye specifically refers to an infection of the **Glands of Zeis** (sebaceous) or **Glands of Moll** (sweat) located at the lid margin. Because these glands are superficial and associated with the lashes, the lesion points outward, hence the name "externum." It presents as a painful, red, and localized swelling at the lid margin. **2. Analysis of Incorrect Options:** * **Chalazion:** This is a **chronic, non-infectious granulomatous inflammation** of the Meibomian glands caused by the blockage of ducts. Unlike a stye, it is typically painless and located away from the lid margin. * **Hordeolum Internum:** This is an acute suppurative infection of the **Meibomian glands**. Because these glands are embedded deep within the tarsal plate, the inflammation is more painful and the pus points toward the palpebral conjunctiva (inward) rather than the skin. **3. NEET-PG High-Yield Pearls:** * **Causative Organism:** *Staphylococcus aureus* is the most common pathogen for both types of hordeola. * **Treatment:** Hot compresses are the mainstay of treatment to facilitate drainage. If a chalazion is recurrent in an elderly patient, always rule out **Sebaceous Cell Carcinoma** via biopsy. * **Key Distinction:** Stye = Glands of Zeis/Moll (Superficial); Hordeolum Internum = Meibomian Gland (Deep).

Question 243: All are features of Trachoma stage III, except?

A. Herbert's pits
B. Pannus (Correct Answer)
C. Necrosis in scar
D. Scar on tarsal conjunctiva

Explanation: To understand this question, one must recall the **McCallan Classification** of Trachoma, which divides the disease into four clinical stages: 1. **Stage I (Incipient Trachoma):** Immature follicles on the upper tarsal conjunctiva. 2. **Stage II (Established Trachoma):** Mature follicles and papillary hypertrophy. 3. **Stage III (Cicatricial Trachoma):** Characterized by **scarring** (cicatrization). 4. **Stage IV (Healed Trachoma):** Disease is inactive; sequelae like entropion or trichiasis may be present. ### Why "Pannus" is the Correct Answer (The "Except") **Pannus** (vascularization and infiltration of the cornea) is a hallmark of **Stage II** (Active/Established Trachoma). While it may persist into later stages, it is the defining feature of the active inflammatory phase, not the cicatricial (scarring) phase. ### Explanation of Other Options (Features of Stage III) * **Herbert’s Pits:** These are pathognomonic small, circular depressions at the limbus. They represent the **scarred** remains of limbal follicles and are a classic sign of Stage III. * **Scar on Tarsal Conjunctiva:** This is the defining feature of Stage III. Linear or star-shaped scars (Arlt’s line) form as follicles necrose and heal. * **Necrosis in Scar:** During the transition to Stage III, the lymphoid follicles undergo necrosis, which is subsequently replaced by fibrous tissue (scarring). ### NEET-PG High-Yield Pearls * **Arlt’s Line:** A horizontal line of scarring found at the junction of the anterior 1/3rd and posterior 2/3rd of the tarsal conjunctiva (Stage III). * **Pathognomonic Sign:** Herbert’s pits are the most specific clinical sign of past Trachoma. * **WHO SAFE Strategy:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Causative Agent:** *Chlamydia trachomatis* serotypes A, B, Ba, and C.

Question 244: A swimmer presents with redness and mucopurulent discharge after exiting a swimming pool. There is no history of contact lens wear, and examination reveals no corneal involvement. What is the probable diagnosis?

A. Acanthamoeba keratitis
B. Adult inclusion conjunctivitis (Correct Answer)
C. Vernal keratoconjunctivitis
D. Angular conjunctivitis

Explanation: **Explanation:** The clinical presentation of acute redness and mucopurulent discharge following swimming pool exposure is a classic "textbook" scenario for **Adult Inclusion Conjunctivitis (AIC)**. **1. Why Adult Inclusion Conjunctivitis is correct:** AIC is caused by *Chlamydia trachomatis* (serotypes D-K). It is often transmitted through contaminated swimming pool water (hence the name "swimming pool conjunctivitis") or via autoinoculation from genital secretions. Key diagnostic features include: * **Follicular response:** Predominantly in the inferior fornix. * **Discharge:** Mucopurulent. * **Chronicity:** If untreated, it persists for weeks to months. * **Preauricular lymphadenopathy:** Often present. **2. Why other options are incorrect:** * **Acanthamoeba keratitis:** Primarily associated with **contact lens wearers** using tap water for cleaning. It presents with disproportionately severe pain and characteristic ring infiltrates on the cornea; the question explicitly states no corneal involvement. * **Vernal keratoconjunctivitis (VKC):** An allergic condition (Type I hypersensitivity) characterized by intense itching, "cobblestone" papillae on the superior tarsal conjunctiva, and Horner-Trantas dots. It is not associated with swimming pools or mucopurulent discharge. * **Angular conjunctivitis:** Caused by *Moraxella lacunata*. It presents with excoriation and redness specifically at the **inner and outer canthi** (angles) of the eye, not generalized conjunctivitis. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** NAAT (Nucleic Acid Amplification Test). * **Cytology:** Shows **Halberstaedter-Prowazek (HP) inclusion bodies** (intracytoplasmic). * **Treatment:** Systemic antibiotics are mandatory (e.g., **Azithromycin 1g single dose** or Doxycycline 100mg BD for 7 days) because it is a sexually transmitted infection; the partner must also be treated.

Question 245: Inclusion conjunctivitis is caused by which of the following microorganisms?

A. Chlamydia trachomatis (Correct Answer)
B. Streptococcus pneumoniae
C. Candida species
D. Neisseria gonorrhoeae

Explanation: **Explanation:** **Inclusion conjunctivitis** (specifically Adult Inclusion Conjunctivitis or AIC) is a follicular conjunctivitis caused by **Chlamydia trachomatis**, specifically the **serotypes D through K**. It is primarily a sexually transmitted infection where the eye is involved via autoinoculation from genital secretions. * **Why Option A is correct:** *Chlamydia trachomatis* is an obligate intracellular bacterium. In AIC, it produces characteristic large, basophilic intracytoplasmic inclusion bodies (Halberstaedter-Prowazek bodies) within conjunctival epithelial cells. It typically presents as a chronic follicular conjunctivitis with mucopurulent discharge and preauricular lymphadenopathy. * **Why Option B is incorrect:** *Streptococcus pneumoniae* is a common cause of acute bacterial conjunctivitis, characterized by petechial hemorrhages and a papillary (not follicular) reaction. * **Why Option C is incorrect:** *Candida* species are fungi. Fungal conjunctivitis is rare and usually occurs secondary to trauma with vegetable matter or in immunocompromised states. * **Why Option D is incorrect:** *Neisseria gonorrhoeae* causes hyperacute purulent conjunctivitis. While it is also sexually transmitted, it presents with profuse "creamy" pus and carries a high risk of rapid corneal perforation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Serotypes:** Remember the "ABC" of Trachoma (Serotypes **A, B, Ba, C**) vs. Inclusion Conjunctivitis (Serotypes **D–K**). 2. **Clinical Sign:** AIC typically presents with **large follicles** in the inferior fornix. 3. **Treatment of Choice:** Oral **Azithromycin** (1g single dose) or Doxycycline (100mg BID for 7 days). Topical treatment alone is insufficient as the systemic reservoir must be treated. 4. **Neonatal Inclusion Conjunctivitis:** Occurs 5–14 days after birth (Ophthalmia neonatorum); it is the most common cause of neonatal conjunctivitis in developed countries.

Question 246: Cobblestone appearance is seen in which of the following conditions?

A. Spring Catarrh (Correct Answer)
B. Viral conjunctivitis
C. Bacterial conjunctivitis
D. Phlyenctenular conjunctivitis

Explanation: **Explanation:** **Spring Catarrh**, also known as **Vernal Keratoconjunctivitis (VKC)**, is a bilateral, recurrent, seasonal allergic inflammation of the conjunctiva, typically affecting young boys in warm climates. The characteristic **"Cobblestone appearance"** (or giant papillae) occurs in the palpebral form of the disease. It is caused by the hypertrophy of the subepithelial lymphoid tissue and connective tissue in the upper tarsal conjunctiva. These large, flat-topped papillae are separated by deep fibrous septa, resembling a cobblestone street. **Analysis of Incorrect Options:** * **Viral Conjunctivitis:** Typically presents with a **follicular response** (small, translucent elevations) and preauricular lymphadenopathy, most commonly caused by Adenovirus. * **Bacterial Conjunctivitis:** Characterized by marked **conjunctival hyperemia (redness)** and mucopurulent discharge, rather than large papillary formations. * **Phlyctenular Conjunctivitis:** A type IV hypersensitivity reaction to endogenous toxins (e.g., Tubercular protein). It presents as a **phlycten** (a small, yellowish-gray nodule) near the limbus, not as cobblestone papillae. **Clinical Pearls for NEET-PG:** * **Type of Hypersensitivity:** VKC involves both Type I (IgE-mediated) and Type IV hypersensitivity. * **Trantas Dots:** White, chalky dots (eosinophils) found at the limbus in the limbal form of VKC. * **Shield Ulcer:** A sterile, transverse oval corneal ulcer seen in severe cases (due to mechanical rubbing of papillae). * **Maxwell-Lyons Sign:** A characteristic "ropy" or "stringy" discharge. * **Treatment:** Mast cell stabilizers (Cromolyn) and topical steroids for acute exacerbations.

Question 247: Which of the following is NOT a feature of allergic conjunctivitis?

A. Itching
B. Papillary hyperplasia
C. Presence of abundant eosinophils in the discharge
D. Usually present throughout the year (Correct Answer)

Explanation: ### Explanation **Allergic Conjunctivitis** is a type I hypersensitivity reaction (IgE-mediated) triggered by environmental allergens. **Why Option D is the correct answer:** Allergic conjunctivitis is typically **seasonal** (Seasonal Allergic Conjunctivitis - SAC), occurring most frequently during spring and summer when pollen, grass, and weed counts are high. While a "perennial" form exists (due to dust mites or pet dander), the classic presentation tested in exams is intermittent and seasonal, not "usually present throughout the year." **Analysis of Incorrect Options:** * **A. Itching:** This is the **hallmark symptom**. In clinical practice and exams, if itching is absent, the diagnosis of allergic conjunctivitis is highly unlikely. * **B. Papillary hyperplasia:** Papillae are the characteristic clinical sign of allergic and mechanical inflammation. They represent vascular tufts with eosinophilic and lymphocytic infiltration, often giving a "cobblestone" appearance in severe cases like Vernal Keratoconjunctivitis (VKC). * **C. Presence of eosinophils:** Since it is a Type I hypersensitivity reaction, conjunctival scrapings typically show eosinophils. While their absence doesn't rule it out, their presence is a definitive diagnostic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Vernal Keratoconjunctivitis (VKC):** A bilateral, recurrent inflammation common in young boys. Look for **Horner-Trantas dots** (white limbal spots consisting of eosinophils and epithelial debris) and **Shield ulcers**. * **Treatment:** The mainstay of treatment includes **Mast cell stabilizers** (Sodium Cromoglycate), **Antihistamines** (Olopatadine), and topical steroids for acute exacerbations. * **Cytology:** Remember, **Eosinophils** = Allergic; **Lymphocytes** = Viral; **Polymorphonuclear cells (PMNs)** = Bacterial.

Question 248: All of the following are complications of chronic staphylococcal blepharoconjunctivitis EXCEPT:

A. Chalazion (Correct Answer)
B. Marginal conjunctivitis
C. Follicular conjunctivitis
D. Phylectenular conjunctivitis

Explanation: **Explanation:** Chronic staphylococcal blepharoconjunctivitis is a chronic inflammatory condition of the lid margins caused by *Staphylococcus aureus* or *Staphylococcus epidermidis*. **Why Chalazion is the Correct Answer (The Exception):** A **Chalazion** is a chronic non-infectious granulomatous inflammation of the **Meibomian glands** (due to blocked ducts). While it is associated with Meibomian Gland Dysfunction (MGD) and posterior blepharitis, it is **not** a direct complication of *staphylococcal* blepharitis, which primarily involves the anterior lid margin and the lash follicles. **Analysis of Incorrect Options:** * **Marginal Keratitis/Conjunctivitis:** This is a classic hypersensitivity reaction to staphylococcal exotoxins. It presents as "catarrhal" infiltrates near the limbus where the lid margin contacts the cornea. * **Follicular Conjunctivitis:** Chronic irritation from bacterial toxins often leads to a follicular response in the palpebral conjunctiva. * **Phlyctenular Conjunctivitis:** This is a Type IV delayed hypersensitivity reaction to bacterial proteins. While historically associated with Tuberculosis, in modern clinical practice, **Staphylococcal antigen** is the most common cause. **High-Yield Clinical Pearls for NEET-PG:** * **Staphylococcal Blepharitis** is characterized by "hard, brittle scales" (collarettes) around the base of eyelashes. * **Seborrheic Blepharitis** is characterized by "soft, greasy scales" and is associated with *Pityrosporum ovale*. * **Trichiasis, Madarosis (loss of lashes), and Poliosis (whitening of lashes)** are common structural complications of chronic staphylococcal infection. * **Treatment:** Lid hygiene (warm compresses/scrubs) and topical antibiotics (Erythromycin/Bacitracin).

Question 249: Viral Conjunctivitis is most commonly caused by which virus?

A. Herpes simplex virus
B. Enterovirus
C. Adenovirus (Correct Answer)
D. Coxsackie A virus

Explanation: **Explanation:** **Adenovirus** is the most common cause of viral conjunctivitis worldwide, accounting for up to 65–90% of all cases. It typically presents as a highly contagious follicular conjunctivitis. Two specific clinical syndromes are high-yield for exams: 1. **Pharyngoconjunctival Fever (PCF):** Caused by serotypes 3, 4, and 7; characterized by fever, pharyngitis, and follicular conjunctivitis. 2. **Epidemic Keratoconjunctivitis (EKC):** Caused by serotypes 8, 19, and 37; more severe, often involving the cornea with pathognomonic **subepithelial infiltrates**. **Analysis of Incorrect Options:** * **Herpes Simplex Virus (HSV):** While a common cause of viral keratitis (dendritic ulcers), it is a less frequent cause of isolated conjunctivitis. It is typically unilateral and associated with vesicular skin lesions. * **Enterovirus & Coxsackie A Virus:** These are the primary causative agents of **Acute Hemorrhagic Conjunctivitis (AHC)** (specifically Enterovirus 70 and Coxsackie A24). While they cause dramatic subconjunctival hemorrhages and have a rapid onset, they occur in explosive epidemics and are less common than Adenoviral infections. **Clinical Pearls for NEET-PG:** * **Preauricular Lymphadenopathy:** A hallmark sign of viral conjunctivitis (especially Adenoviral). * **Transmission:** Highly contagious via respiratory droplets or contaminated fingers/ophthalmic instruments (Tonometers). * **Management:** Primarily supportive (cold compresses, artificial tears). Steroids are contraindicated in the acute phase unless membranes/pseudomembranes are present.

Question 250: Trantas spots are seen in which of the following conditions?

A. Vernal conjunctivitis (Correct Answer)
B. Eczematous conjunctivitis
C. Ophthalmia nodosa
D. Tularemia

Explanation: **Explanation:** **Trantas spots** (also known as Horner-Trantas spots) are a pathognomonic clinical feature of **Vernal Keratoconjunctivitis (VKC)**, a bilateral, recurrent, seasonal allergic inflammation of the conjunctiva typically affecting young males. 1. **Why Vernal Conjunctivitis is correct:** Trantas spots are small, white, chalky elevations found at the **limbus**. They are composed of collections of **eosinophils and degenerated epithelial cells**. They are most commonly seen in the limbal or mixed variety of VKC. Their presence indicates active disease. 2. **Why other options are incorrect:** * **Eczematous conjunctivitis:** Also known as Phlyctenular keratoconjunctivitis, it is characterized by "phlyctens" (small greyish-yellow nodules) which are a type IV hypersensitivity reaction to endogenous bacterial proteins (most commonly Tubercular protein), not eosinophilic aggregates. * **Ophthalmia nodosa:** This is a granulomatous inflammation caused by the penetration of caterpillar hairs into the ocular tissues. It presents with nodules but lacks the allergic eosinophilic pathology of Trantas spots. * **Tularemia:** This causes Parinaud’s Oculoglandular Syndrome, characterized by granulomatous conjunctivitis with regional lymphadenopathy, usually following contact with infected animals (rabbits). **High-Yield Clinical Pearls for NEET-PG:** * **VKC Hallmarks:** Cobblestone/Giant papillae (Palpebral form), Shield ulcers (due to macro-papillae rubbing the cornea), and Maxwell-Lyons sign (stringy discharge). * **Pathology:** Type 1 and Type 4 hypersensitivity reactions. * **Treatment:** Mast cell stabilizers (Olopatadine) are the mainstay; topical steroids are used for acute exacerbations.

Practice by Chapter

Conjunctivitis: Bacterial

Practice Questions

Conjunctivitis: Viral

Practice Questions

Conjunctivitis: Allergic

Practice Questions

Conjunctivitis: Chronic

Practice Questions

Degenerations of Conjunctiva

Practice Questions

Benign Tumors of Conjunctiva

Practice Questions

Malignant Tumors of Conjunctiva

Practice Questions

Conjunctival Manifestations of Systemic Diseases

Practice Questions

Cicatricial Conjunctival Disorders

Practice Questions

Pterygium and Pinguecula

Practice Questions

Conjunctival Trauma

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Subconjunctival Hemorrhage

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